Process for the manufacture of 2:3-diamino-anthraquinone



Patented dune i 1260 tttt'lli WILHELM IEQQER, 01? EAM ZL, SWITZERLAND, ASSIGNGE TG SQCIE TY @1 5 CHEMICAL IN- EDUS'IZRY IN BASLE, F BASEL, SWITZERLAND.

PEQGESS FGR THE MANUFACTURE OF QIS-IDIAMINQ-ANTHEAQUINONE.

Etc Drawing. Application filed April 13, 1923, eerie-. no. 6319M and in fiwttzerland may 2%, 1922.

I have found that 2:8-dia1nino-anthra quinone can be made in a very simple manner by heating 2-amino-3-bromo-anthraquinone with liquids containing ammonia in a closed vessel at I'M-190 C. The reaction may also be conducted in presence of a catalyst, for instance of a copper compound.

The 2:3-diamino-anthraquinone thus obtained isvery pure.

E trample,

125 parts by weight of 2-amino-3-bromoanthraquinone are heated with 1000 parts of aqueous ammonia solution of 28 per cent strength in anautocleve having a. st1rrer for 24 hours at 175185 C. When the mixture has cooled the reaction product is filtered conducted in presence of a catalyst for instance of a copper compound.

What I claim is 1. The herein described process for the manufacture of 2: S-diamino-anthraquinone, consisting in heating 2-emino-3-bromo-anthraquinone with liquids containing ammonia in "a closed vessel. l

2. The herein described process for the manufacture of 2 3-diamino-anthraquinone, consisting in heating 2-arnino-3-brorno-anthraquinone with liquids containing ammonia in presence of a copper compound in a closed vessel. v y Y 3. Asa new product the 2:3-diaminoanthraquinone obtained by heating in a closed Vessel 2-amino-3-bromoanthraquinone with liquids containing ammonia, which'product forms a dark brown powder, dyeing acetate silk weakly yellowish-brown tints,

In witness whereof 11 have hereunto signed my name this 26th day of March 1923.

. LM MOSER. 

